Route Communale 100-B is an auxiliary route located entirely within the commune of Arcahaie, Haiti. It runs from the RN-1 intersection in Saint-Medard to the center of Arcahaie, a distance of about 3.4 km (2.1 miles). It runs near the Aubry River throughout its journey in Des Vases, crosses into Ville de l'Arcahaie, and abruptly ends at Rue Jean-Francois Jeannot 0.2 km (0.13 miles) west of the Place Des Armes.